Unicode 15.0.0 was updated from:
- https://www.unicode.org/Public/15.0.0/ucd/
- https://www.unicode.org/Public/15.0.0/ucd/auxiliary/
- https://www.unicode.org/Public/15.0.0/ucd/emoji/

When updating the Unicode version please follow these steps:

The latest vesrion of the Unicode Character Database can be found at
https://www.unicode.org/Public/UCD/latest/ucd/

1. Copy the following files to lib/stdlib/uc_spec/ replacing existing ones.
No subfolder should be created.
  - CaseFolding.txt
  - CompositionExclusions.txt
  - PropList.txt
  - SpecialCasing.txt
  - UnicodeData.txt
  - auxiliary/GraphemeBreakProperty.txt
  - emoji/emoji-data.txt
  - EastAsianWidth.txt

2. Copy the following test files to lib/stdlib/test/unicode_util_SUITE_data/
replacing existing ones. No subfolder should be created.
  - NormalizationTest.txt
  - auxiliary/GraphemeBreakTest.txt
  - auxiliary/LineBreakTest.txt

3. Update the "spec_version()" function in the generator by replacing the Unicode
version in lib/stdlib/uc_spec/gen_unicode_mod.escript

4. Read the release notes by visiting https://www.unicode.org/versions/latest/
and assess if additional changes are necessary in the Erlang code.

5. Replace all ocurrences of previous version of Unicode with the new one in
this very same file (lib/stdlib/uc_spec/README-UPDATE.txt).
Remember to update these instructions if a new file is added or any other change
is required for future version updates.

6. Check if the test file needs to be updated:
   (cd $ERL_TOP/lib/stdlib/uc_spec; escript gen_unicode_mod.escript update_tests)
   If ../test/unicode_util_SUITE_data/unicode_table.bin is updated include it in
   the commit.

7. Run the test for the Unicode suite from the OTP repository root dir.
   $ export ERL_TOP=$PWD
   $ export PATH=$ERL_TOP/bin:$PATH
   $ ./otp_build all -a && ./otp_build tests
   $ cd release/tests/test_server
   $ erl
   erl> ts:install().
   erl> ts:run(stdlib, unicode_SUITE, [batch]).